FIG. 256. Ancestors of man represented by remains of skulls 



/, Pithecanthropus erectus, the " erect ape-man " of Java ; 2, the Neanderthal man ; j, the 

 negroid man of Laussel ; 4, Nebraska glacial man. These four types represent succes- 

 sive advances in the evolution of the human races, although we must not think of them 

 as a straight series of our ancestors. Compare the size of the brain at different stages 

 of development: Pithecanthropus, 850 cc. ; Piltdown, 1300 cc. ; Neanderthal, 1600 cc.; 

 modern man, 1500-1800 cc. 



